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Restructuring and Other Initiatives (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		21 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 343	$ 480	$ 919	$ 564	$ 1,122	$ 1,122
Additions, interest accretion and other		80	211	334	499
Payments		(185)	(162)	(523)	(645)
Revisions to estimates and effect of foreign currency		(32)	(30)	(32)	(38)
Balance at end of period		343	938	343	938	343
GMI [Member] | Australia, New Zealand and Thailand [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges				657
GMI [Member] | Australia, New Zealand and Thailand [Member] | Supplier Claims [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges		$ 76
GMI [Member] | Australia, New Zealand and Thailand [Member] | Asset Impairments, Sales Allowances, Inventory Provisions and Other Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges				367
GMI [Member] | Australia, New Zealand and Thailand [Member] | Dealer Restructuring and Employee Separation Payments [Member]
Restructuring Reserve [Roll Forward]
Payments				(222)
Pre-tax restructuring charges				290
GMI [Member] | Australia and New Zealand [Member]
Restructuring Reserve [Roll Forward]
Valuation allowance against deferred tax assets				236
GMNA [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges			390		1,500
Cost since inception							$ 3,100
GMNA [Member] | Pension Curtailment and Other Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges			209
GMNA [Member] | Supplier-related Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges			$ 181		421
GMNA [Member] | Employee Severance and Statutory Pension Payments [Member]
Restructuring Reserve [Roll Forward]
Payments				$ (314)	(645)
GMNA [Member] | Non-cash Accelerated Depreciation, Pension Curtailment and Other Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges					$ 1,100
GMNA [Member] | Employee Severance and Supplier-related Payments [Member]
Restructuring Reserve [Roll Forward]
Payments						$ (1,400)
Forecast [Member] | GMI [Member] | Australia, New Zealand and Thailand [Member]
Restructuring Reserve [Roll Forward]
Expected amount of cash flows	(40)
Forecast [Member] | GMI [Member] | Thailand [Member]
Restructuring Reserve [Roll Forward]
Proceeds from sale of business	140
Forecast [Member] | GMNA [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Expected amount of cash flows	$ (100)

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- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost including foreign currency translation adjustments, excluding adjustments for costs incurred during the period and costs settled during the period.

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